The Vertical Speed Indicator - Ch 4

Question 1

VSI (also known as)

Answer 1

RCDI (rate of climb and descent indicator)
Variometer (vario) for gliders
Special Gauge

Logarithmic Scale

Question 2

Operation

Answer 2

Compared the actual/real p to the case px
Sensing the RoC of the p around AC
Climb = contracts Descent = Expands
Slight Delay

Question 3

Measuring Unit

Answer 3

Knife Edge = Turbulent
Capillary = Laminar

Work together to keep the flow rate constant
Constant flow value when climbing or descending

Question 4

Construction

Answer 4

External Feed

Internal Reference

Question 5

Errors

Answer 5

IMP

TBT

Question 6

IVSI

Answer 6

Accelerometer - parallel to the original - DASHPOT
Inertial Measurer - Climb goes down, Descent goes up
Eliminates time lag
Turning factor - turn may give climb indication

Question 7

Blockages

Answer 7

Px change will show 0 eventually (equalise)

Question 8

Leaks

Answer 8

Outside px hull - less accurate

Inside px hull - higher px therefore descent indicated